The Ever Given is out of the way. Ships are again going through the Suez Canal. Now attention turns to why it got stuck.

Experts on Tuesday boarded the massive container ship that blocked Egypt's vital Suez Canal and disrupted global trade for nearly a week, seeking answers to a single question that could have billions of dollars in legal implications: What went wrong?

As convoys of ships again began traveling in this artery linking East and West through the Mediterranean and Red Seas, hundreds more idled waiting for their turn. Egyptian government officials, insurers, shippers and others similarly waited for more details about what caused the skyscraper-sized Ever Given to become wedged across the canal's southern single-lane on March 23. The grounding of the ship had halted billions of dollars a day in maritime commerce. Those losses, as well as physical damage from the incident, likely will see lawsuits.